from embryology particularly, which
has in the last decades provided such signal instances
of the unravelling of obscure problems, that we have to
expect a definite clearing up of the problems relating
to the development of the head."--Mueller's _Archiv_, p.
121, 1837.

[199] _Anat.-phil. Unters. ue. d. Kiemenapparat u. d. Zungenbein_, Riga
and Dorpat, 1832.

[200] "Bildungs- und Entwickelungs-geschichte des Blennius viviparus,"
_Abhandl. z. Bild. u. Entwick.-Gesch. des Menschen u. der Thiere_,
ii., pp. 1-68, Leipzig, 1833.

[201] _Von den Ur-Theilen des Knochen und
Schalen-Gerustes_, Leipzig, 1828.

[202] _Kiemenapparat_, pp. 107-118.

[203] _Vergleichende Anatomie der Myxinoiden_. Part I.
(Osteology and Myology). (_Abh. koenigl. Akad. Wiss.
Berlin_, for 1834, pp. 65-340, 9 pls., 1836.) Also
separately.

[204] "Ueber die Visceralbogen der Wirbelthiere in
Allgemeinen und deren Metamorphosen bei den Voegeln und
Saeugethiere," Mueller's _Archiv_, pp. 120-222, 1837.

[205] _Handbuch d. menschl. Anatomie_, iv., p. 47.

[206] This was shown by Serres (_Ann. Sci. nat._, xi., p.
54 f.n., 1827), who found in a human embryo a long
cartilaginous piece extending from the ear-ossicles to
the inside of the lower jaw, and suggested that it was
the foundation of the permanent mandible.

[207] _Abhandl._, i., p. 102, 1832; ii., p. 25, 1833. (_Blennius_
paper).

[208] _Vergleichende Entwickelungsgeschichte des Kopfes der nackten
Amphibien_, Koenigsberg, quarto, 276 pp., 1838.

[209] Mueller's _Archiv_ for 1838.

[210] _Entwickelungsgeschichte der Natter_, Koenigsberg,
1839.

[211] _Bemerkungen ueber die Entwickelung des Schaedels der
Wirbelthiere_, Koenigsberg, 1839.

[212] _Handbuch der Physiologie des Menschen_, Koblenz,
1835; Eng. trans. by W. Baly, ii., p. 1615, 1838.

[213] For a full statement of Rathke's conclusions, see
the translation given by Huxley in _Lectures on the
Elements of Comparative Anatomy_, London, 1864.

[214] _Entwickelungsgeschichte der Wirbelthiere_, p. 142,
1861.

[215] _Embryologie des Salmones_. A separate volume of L.
Agassiz's _Histoire naturelle des Poissons d'Eau douce
de l'Europe centrale_, Neuchatel, 1842.

[216] _Untersuchungen ueber die Entwickelungsgeschichte der
Gebuertshelferkroete_,